Bicycle frame



FIG. 1 is a perspective back, top, and side view of the bicycle frame.

FIG. 2 is a side view of the bicycle frame.

FIG. 3 is a front view of the bicycle frame.

FIG. 4 is a rear view of the bicycle frame; and,

FIG. 5 is a top view of the bicycle frame. 

The ornamental design for a bicycle frame, as shown and described. 